Pyrolysis of castor oil methylesters to 10-undecenoic acid and heptaldehyde

119-128<span style="font-size:11.0pt;line-height: 115%;font-family:Calibri;mso-fareast-font-family:" times="" new="" roman";mso-bidi-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-US">The results of the pyrolysis of methyl esters of castor oil in a continuous tubular reactor to produce methyl undecenoate and heptaldehyde are discussed. Flow rates of esters, pyrolysis temperature and ester to steam ratios have been investigated as the process variables to arrive at the optimum values. Moreover, the literature pertaining to pyrolysis of castor oil has been reviewed.</span

Biochemical Characterization of Multiple Myeloma Patients across ISS Stages – A Data Base Workup from a Tertiary Care Hospital in India

Background: Multiple myeloma (MM) is slowly becoming a huge medical burden, challenging the health-care systems of Asian countries. Because of the unavailability of widespread access to various modalities of investigations, and paucity of well compiled data on common presenting features and various laboratory parameters in various stages of MM in India, the diagnosis is usually delayed till complications begin to occur. This study is an attempt to fill this gap and to establish database for future reference. Methods: The study was conducted in a tertiary health care centre over a span of 3 years and 94 patients diagnosed as MM with complete workup including beta2 microglobulin (β2M), bone marrow plasma cell percentage, serum protein electrophoresis, serum and urine Immunofixation and serum Free Light Chains (FLC) were included. The various laboratory parameters were statistically analyzed across ISS stages I, II and III. Results: We found a male to female ratio of 1.47:1. The mean age of patients was 55.5±11.78 yrs. Backache was the most frequent presentation (30%) of the patients followed by generalized weakness (22%). The percentage of plasma cells, hemoglobin, urea, creatinine, uric acid, calcium and β2M showed significant difference across the stages. 38.3% of the patients were in stage III, 29.8% in stage II and 31.9% in stage I. IgGκ type constituted 70%, other fraction being IgGλ (10%), IgMκ (10%), IgAκ (5%) and IgAλ (5%). M band was not seen in 11% of patients.Conclusion(s): The presentation of MM is nonspecific and patient can come with varied presentations at onset. We have biochemically characterized the three stages of MM and this will form a basis for further larger studies on these lines and to develop stage-based algorithms for early and better diagnosis and prognosis of MM.</jats:p

Functional relationship of ammonia to DNA, RNA and protein in brain

The functional significance of the production of ammonia during neuronal activity is not known, although a number of studies are available concerning the mechanism of ammonia toxicity in brain. Hyperammonemia without behavioural change was induced in experimental rats by i.p. administration of either a single dose of ammonium acetate or 6 doses with an interval of 1 h during the day or one single dose daily for 7 days. No significant change was observed in the content of DNA, RNA and protein in cerebral cortex, cerebellum and brain stem following the administration of a single dose. There was a marked decrease in the content of DNA in all three brain regions after the administration of 6 hourly doses of ammonium acetate. Under these conditions the RNA was found to increase in all three brain regions. A decrease in the content of protein per gram wet weight was observed in cerebral cortex and brain stem while the change in cerebellum was found to be insignificant. However, the content of RNA and protein was found to show a very significant increase when expressed per microgram of DNA for each region under these conditions, indicating an increase in RNA and protein in the cells surviving the toxic damage caused by ammonia. A marked and significant increase in the content of RNA and protein was observed in all three brain regions following the administration of a single dose per day for 7 days. These results are discussed not only with respect to toxic damage to the glial cells by ammonia, but also with respect to the probable effect of ammonia liberated during neuronal activity on inhibition of lysosomal degradation of protein, and on its stimulatory effects of transcriptional and translational activities. The increased RNA and protein under these conditions may be contributing not only in the proliferation of glial cells (Alzheimer Type II cells) but also in the dendritic spinous growth